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通过金相、SEM和TEM观察,表面粗糙度测试和电化学实验方法,对经过不同温度淬火和回火的国产Cr13型马氏体不锈钢的微观组织演变及其对材料硬度,表面光洁度和耐蚀性能的影响进行了分析研究。结果表明,马氏体是基体中的主要相,当回火温度为650℃时,铁素体变成基体中的主要相,随着回火温度的提高,不锈钢基体组织发生了由回火马氏体到回火索氏体的演变。回火后,材料的硬度降低,当回火温度达到650℃,材料硬度降至22 HRC,其表面光洁度大幅度降低。同时,回火材料的耐点蚀性能低于淬火态材料,且随着回火温度的提高,马氏体不锈钢的点蚀电位降低,并在500℃时达到最差。
The microstructure evolution of domestic Cr13-type martensitic stainless steel quenched and tempered at different temperatures and its effect on the hardness, surface finish and corrosion resistance of the material were studied by metallographic, SEM and TEM observations, surface roughness tests and electrochemical experiments. The impact of performance was analyzed. The results show that martensite is the main phase in the matrix. When the tempering temperature is 650 ℃, ferrite becomes the main phase in the matrix. With the increase of tempering temperature, Evolution of martensite to tempered sorbite. After tempering, the hardness of the material decreases. When the tempering temperature reaches 650 ℃, the surface hardness of the material decreases to 22 HRC. Meanwhile, the pitting corrosion resistance of tempered materials is lower than that of quenched materials, and the pitting potential of martensitic stainless steel decreases with the increase of tempering temperature and reaches the worst at 500 ℃.